Rotary fuel-burner assembly



June 12, 1928.

- J. H. STEWART ROTARY FUEL BURNER ASSEMBLY 2 Sheets-Sheet INVENTOR.

ATTORNEY.

k? 0 IE June 12,1928. I 1,673,302

- J. H. STEWART ROTARY FUEL BURNER ASSEMBLY File H e, 1926 2 Sheets-Shee 2 'svviyikxlelwf' J I ATTORNEY.

Patented June 12, 1928.

UNITED STATES JOHN H. STEWART, OF CINCINNATI, OHIO.

ROTARY FUEL-BURNER ASSEMBLY.

Application filed March 8, 1926. Serial No. 98,008.

My invention relates to the general class of burners for fuel oil and particularly to the class of horizontally rotatable burners in which oil is discharged into the fire box i of a furnace from a rotating cup shaped nozzle.

It is the object of m invention to provide improvements in t e structure of the operating parts of the burner and also in the mounting of the burner assembly. It is a further object to provide an assembly unit in which the parts are arranged and constructed in such a. manner as to provide great saving in space, accessibility to all the operatin parts and great saving in the cost of assem ling. I

Amon my specific objects are the provision a burner assembly in which wear of moving arts is limited to two bearings. Another ob ect is the elimination of vibra tion and accessibility to the operating parts which I accomplish by adjustably mounting the burner assembly inde endently of the furnace, on the floor in furnace. This novel mounting prevents vibration of the furnace pipes and rovides a simple means of movingthe assem l to a position in which it will be accessib e for inspection, adjustment and repair. Another object is the provision of an oil drain in the base of the assembly which will direct any oil leakage back into the fire box of the furn'ace.

It is m object to I which wil be adjustab e to a wide range of capacities which will greatly reduce manufacturing costs. In my novel assembly another object is the provision of a fan mounting which will permit the insertion of more than one fan on the same shaft which further increases the adaptability of my burner for widely different requirements. It is one of my important objects to create an air cont-r01 device which will allow very accurate adjustment of the primary air currents and a secondary air supply which has a secondary object of no small importance in enabling such adjustment that the noise of rushing air is reduced to a minimum.

It is my object to provide an assembly in which there are no small holes to become clogged up, a feature which is of great practical importance, particularly in domestic plants in which the owner of the house usually does not have enough mechanical rout of the rovide an assembly skill to clean out the assembly, and thus discover any oil sto page. Broadly it is m object to rovi e a burner assembly w ich has suc a high overall efiiciency that a much smaller motor than is usually required can be successfully used. Further, any tendency to heat up is avoided by providing an air supplychamber which extends about the motor so as to keep the motorconstantly cool. The cool air passing over the motor is heated so that myv air current supply accomplishes a double purpose of both cooling the motor and warming the combustion air. l

A further object is the provision of a novel flame tube which accomplishes maximum vaporization, and more perfect combustion so that the position of maximum combustion will be lower down in the combustion chamber. This provides a longer gas travel and increases the efiiciency and reduces the necessary combustion chamber volume and enables the use of electric are i ition as described in my co-pending apfiled March 11,

p ication Serial No. 94,080, 1926.

The above and other objects are accom:

plished by that certain construction and arrangement of parts which will be hereinafter described.

Referring to the drawings in which I have illustrated a preferred form of burner assembly and burner assembly mounting;

Figure 1 is a side elevation of my burner assembly and mounting.

Figure 2 is an enlarged vertical section illustratin that portion of the burner assembly which carries the rotating cup.

Figure 3 is an end elevation of the burner atomlzer cup showing the oil openings.

Figure 3 is a detail showing my novel flame tube construction.

Figure 4 is a rear and elevation showing the general assembly and the air control shutter.

Figure 5 is a plan view of the burner saddle.

Figure 6 is an end view of the saddle illustrated in Figure 5.

Figure 7 is a section along the lines 7-7 in Figure 5.

Generally indicated at 1 is the base on which the assembly is mounted. The base is preferably cemented or bolted to the floor of the furnace room. The base illustrated has rounded tracks 2 on which the saddle generally indicated at 3 which carries .the burner assembly is adjustably mounted. The tracks may conveniently be made by the ordinary process of stamping. The portion of the base between the tracks has an inclined surface 4 extending longitudinally of the base and preferably sloping from back to front so that a gravity flow pipe 5 which is connected with the front end of the base may be conveniently utilized for draining any oil which leaks out of any of the oil pipe connections back into the bottom of the ash pit of the furnace where it will be ignited by the heat of the furnace.

The motor is encased in a casing which is preferably made in front and back pieces, with a front piece 6 being secured by a cast spider 7 to the journal 8 of the motor and preferably being engaged by the mounting plate 9 of the motor, and the back piece 10 being adapted to slidably engage the front piece with co-operating beadin as indicated at 11 for forming a partia ly locking engagement.

The motor saddle 3 has a circular raised central portion 12 having concave enga ement portions 13 which may be formed y stamping the metal of which the saddle is made. The side edges of the saddle are curved as at 14 to form concave guides to engage the convex tracks 2; Thumb screws 15 may be mounted in the brackets 15 to bear against the curved portions so that the assembly after being suitably adjusted may be retained in such adjusted position. The

, surface of the saddle is stamped with suitable corrugations as indicated at 16 increase its strength. .1 have further found it preferable to crimp back the end edge of the curved portions 14 as at 17 in order to provide additional reinforcement in these positions. An aperture 18 in the center of the saddle forms a convenient method of mounting the motor generally indicated at 19. A bolt 20 extends through the mounting plate 9 of the motor, spring 21 bearing against the nut 22 of the-bolt provides a convenient pivot for the motor assembly so that if it is desired to withdraw the assembly from its position in front of the furnace the thumb screws 15 are loosened and the saddle carrying the motor is moved back on the tracks 2 of the base to a suitable position when the entire assembly may be swiveled as desired on the axis of the bolt 20. For providing primary air currentI preferably mount in accordance with the reguirements fans or a fan such as the one inioated at 21 on the exposed end 22 of the motor shaft and in order to regulate the input of air the casing piece 10 is perforated with elongated apertures 23 and a cover plate 23 having elongated apertures of similar dimensions, axially mounted on a thumb screw 24, makes it a simple matter to thus provide any desired quantity of air for the fan.

The supply of oil for the burner flows into a coupling piece 25 on the base 1 from which a flexible tube 26 extends to an electrical cut-off valve 27 which is not specifically described as any suitable valve in series or shunt with the electric lines to the motor which automatically shuts off when the current to the motor is cut off will serve the purpose. From the cut-off valve 27 the oil passes through a tube 29 to an aperture 28 in the housing member 7. The motor shaft 30 is surrounded by a tubular member 31 and another tubular member 32 of larger diameter than the tube 31, both tubes being preferably fixedly mounted in the housing 7 so that an annular orifice 33 provides access for the oil to pass to the rotating atomizer. The atomizer or cup itself, generally indicated at 34, is mounted on a squared block 35 which is secured to the end of the shaft 30 of the motor, and the inner end of the cup encloses but preferably does not bear against the outer periphery of the outer tube 32 so that the passage for oil extends from the orifice 33, through the segmental openings 36 between the outer sides of the squared block and the inner walls of the-cup. With the operation of the motor the cup is rotated and oil passing through the orifices 36, is projected in a finely atomized spray from the outer edges of the cup in the direction of the arrows a.. A strong current of air I from within the casing, preheated by passage about the motor, is at the same time projected in a counter current inwardly in the direction of the arrows b. The air emerges from within the casing through passages 37 in the housing 7. The result of the current of airstriking the fine spray of oil is to form an intimately mixed cloud of atomized oil which will readily ignite and burn in the fire box of the furnace.

. In order to provide either a secondary air supplyor a tightly sealed joint I have provided a-flame tube 37 within the furnace opening, and I have mounted a housing nut 38 and a nozzle 39 in threads on the outer side of the housing 7 which will allow adjustment after the burner assembly is moved into position. A peripheral ledge 40 at the front end of the nozzle. in case atight joint is required, provides a suitable means of retaining asbestos packing or the like with which a tight joint may be formed befurnace in a gaseous state. This lowers the position of the maximum intensity of the fire and allows a longer passage for the burned gases within the furnace, thereby increasing its heating efficiency.

Having thus described a specific model embodying the principles of my invention What I claim as new and desire to secure by Letters Patent is:-

1. In combination with an oil burner assembly, a casing enclosing said assembly, a

mounting member for said assembly, said mounting member provided with slidable su porting means for said assembly, said sd i dable supporting means comprising a saddle on which said oil burner assembly is vertically pivoted, and said saddle havingslidable engaging members slidable on said mounting member. a

2. In combination with an oil burner as sembly, a casing enclosing said assembly, a mounting member for said assembly, said mounting member provided with slidable supporting means for said assembly, said slidable supporting means comprising a saddle on which said oil burner assembly is pivotally mounted, and said saddle havin slidable engaging members slidable on sai mounting member, and said mountin member having an oil passage therein or the passage of oil leaking from said burner assembly.

3. A-support for an oil burner comprising a saddle on which said burner may be mounted, and a base having tracks on which said saddle is slidably mounted, and adjustable means for retaining said saddle on saidbase. said saddle being vertically pivoted on said base.

JOHN H. STEWART. 

